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Study On The Ore- Forming Fluids Of Jiuxing Iron Deposit In Congjiang County,gui Zhou Province

Posted on:2016-06-24Degree:MasterType:Thesis
Country:ChinaCandidate:W J HeFull Text:PDF
GTID:2180330479955484Subject:Mineral prospecting and exploration
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The Jiuxing iron deposit is locted at Congjiang county,Gui zhou province. its tectonic position is lies in the Jiangnan paleocontinent, that is a transition zone between Yangtze Platform and South China fold belt.It had successively suffered Wuling Period,Caledonian Period, Indo-Chinese epoch Period and Himalayan Period. Its regional stratigraphy includes Wentong Formation(Pt3w) and Tangliu Formation(Pt3t) of Sibao Group in Neo-proterozoic; Jialu Formation(Qbj),Wuye Formation(Qbw),Fanzhao Formation(Qbf)of Xiajiang Group Qingbaikou system in Neo-proterozoic.The study was built on the predecessors’ s in this paper. Based on the features of the deposit geology and Ore-forming fluid geochemistry,the features and sources of the fluid ore- forming were obtained. The function and significance of the ore-forming fluid to Jiuxing iron deposit is discussed from the following chapters. The achievements and conclusions are listed as follows:(1) The features of the deposit geology suggested that there should be several sources of ore-forming materials and multiple mineralization. It results from regional metamorphism period, hydrothermal mineralization period and the supergenetic oxidation period.(2) The petrography characteristics of the fluid inclusions in quartz from polarizing microscope show that the main types of fluid inclusions for Jiuxing iron deposit in the hydrothermal mineralization period is liquid inclusions. The liquid composition mainly is Nacl-H2 O aqueous solution.(3) The results of Fluid-inclusion microthermometric data are as follows: the salinity is about 0.71~21.61 wt%(Na Cl eqv), average being 13.40 wt%(Na Cl eqv);the homogenization tempreture is about 108 ~ 383 ℃, average being 220 ℃; the metallogenic pressure is about 8.9 ~ 46.9Mpa, average being 24.37MPa; the mineralization depth is about 0.35~1.56 Km, averge being 0.90 Km.(4) Raman spectroscopy analysis of the individual fluid inclusions shows that liquid composition mainly is H2 O, secondly for N2 and CO2;gas composition mainly is H2 O, N2 and CO2.(5) The tests of the oxyhydrogen isotope in the deposit show that δ OQtz SMOW is ranges from 10.2~10.8‰, δDH2O SMOW is ranges from-101.5~-89.0‰. Based on calculation, δ OH2 O SMOW is ranges from 1.16~1.24‰, average being-0.18‰. It’s suggests that ore-forming fluid was polygenetic.In conclusion, there was a complex Ore-forming Mechanism of Jiuxing iron deposit was shown in the research. Regional metamorphism formation, lithology, and structure create favorable conditions for fluid ore forming progress. They providing thermodynamic power for mobilization and transportation of ore forming fluid. Ore forming elements may enrichment and mineralization in suitable environment.
Keywords/Search Tags:ore-forming fluid, fluid inclusion, Jiuxing iron deposit, Congjiang county, Gui zhou province
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